Figure 4.

Maximum clade credibility chronogram from BEAST analysis of gapCp. Mean divergence time estimates are given, and blue bars represent 95% highest posterior density (HPD) intervals around these means. Branches without bars were present in fewer than 50% of trees in the posterior distribution and so did not receive annotation. Black circle with A indicates the node used for calibration, which was modeled as a lognormal prior based on a secondary estimate of the root age of Dryopteris[16]. Colors are as in Figures 2, 3.

Sessa et al. BMC Evolutionary Biology 2012 12:104   doi:10.1186/1471-2148-12-104
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